multcompView-package {multcompView}R Documentation

Summarize multiple paired comparisons

Description

Convert a logical vector or a vector of p-values or a difference or distance matrix into a display identifying the pairs for which the differences were not significantly different or for which the difference exceeded a threshold.

Details

Package: multcompView
Type: Package
Version: 0.1-0
Date: 2006-08-06
License: GPL

Convert a logical vector or a vector of p-values or a difference or distance matrix into either a letter-based display using "multcompLetters" or a graphic roughly like a "T" using "multcompTs" to identify factor levels or similar groupings that are or are not significantly different. Designed for use in conjunction with the output of functions like TukeyHSD, dist{stats}, simint, simtest, csimint, csimtest{multcomp}, friedmanmc, kruskalmc{pgirmess}.

Author(s)

Spencer Graves and Hans-Peter Piepho with help from Sundar Dorai-Raj

Maintainer: Spencer Graves <spencer.graves@pdf.com>

References

Piepho, Hans-Peter (2004) "An Algorithm for a Letter-Based Representation of All-Pairwise Comparisons", Journal of Computational and Graphical Statistics, 13(2)456-466.

John R. Donaghue (2004) "Implementing Shaffer's multiple comparison procedure for a large number of groups", pp. 1-23 in Benjamini, Bretz and Sarkar (eds) Recent Developments in Multiple Comparison Procedures (Institute of Mathematical Statistics Lecture Notes-Monograph Series vol. 47)

Examples

dif3 <- c(FALSE, FALSE, TRUE)
names(dif3) <- c("a-b", "a-c", "b-c")
multcompTs(dif3)
multcompLetters(dif3)

library(MASS)
multcompBoxplot(Postwt~Treat, data=anorexia)

[Package multcompView version 0.1-0 Index]